Question

1. **represent a bohr model for an ion with a charge of +3, 8 protons, and 7 neutrons.

bohr model: diagram of concentric circles
observations:

• identity: ______
• symbol: ______
• # of protons: ______
• # of electrons: ______
• # of neutrons: ______
• charge: ______
• mass #: ______

Explanation:

Step1: Determine the element (Identity)

The number of protons is 8, so the element is Oxygen (since the atomic number, which is the number of protons, for Oxygen is 8).

Step2: Calculate the number of electrons

For an ion with a charge of +3, the charge is given by \( \text{Charge} = \text{Number of protons} - \text{Number of electrons} \). So, \( +3 = 8 - \text{Number of electrons} \), which means \( \text{Number of electrons} = 8 - 3 = 5 \).

Step3: Calculate the mass number

Mass number (\( A \)) is the sum of protons and neutrons. So, \( A = 8 + 7 = 15 \).

Step4: Determine the symbol

The symbol for Oxygen with mass number 15 and charge +3 is \( \ce{^{15}O^{3+}} \).

Step5: Fill in the observations

• Identity: Oxygen
• Symbol: \( \ce{^{15}O^{3+}} \)
• # of protons: 8
• # of electrons: 5
• # of neutrons: 7 (given)
• Charge: +3 (given)
• Mass #: 15 (calculated as 8 + 7)

For the Bohr model: The nucleus (center) contains 8 protons and 7 neutrons. The electron shells: The first shell can hold up to 2 electrons, the second shell can hold up to 8, but here we have 5 electrons. So, the first shell has 2 electrons, the second shell has 3 electrons (since 2 + 3 = 5).

Answer:

• Bohr Model: Nucleus (8 protons, 7 neutrons), first electron shell: 2 electrons, second electron shell: 3 electrons.
• Observations:
• Identity: Oxygen
• Symbol: \( \ce{^{15}O^{3+}} \)
• # of protons: 8
• # of electrons: 5
• # of neutrons: 7
• Charge: +3
• Mass #: 15